We've got weirdos, creeps, and also everyone who dares to be publicly sex positive!
Don't worry though, Internet Culture is definitely really progressive and not at all unable to be adults about anything, definitely beyond being sexually repressed and repressive in public and weird and fetishistic in private.
Why do you think purple is a stranger to blue? Doing a "horny jail" boop is a lightly comical thing, which would be an odd way for a stranger to respond to that comment.
It seems that they know each other in some context, and purples "joking" bop reply turning deadly is the punchline.
It's a much worse joke if its two strangers where one defends themselves with force from sexual assault and then is reasonably traumatized by the outcome.